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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

Administrative data

Description of key information


At ambient temperature and pressure, dimethylolpropionic acid is a white crystalline solid with a slight odour.

Melting point

The melting point of dimethylolpropionic acid is 463 K (190 °C).

Boiling point

The boiling point of dimethylolpropionic acid cannot experimentally be determined due to decomposition.


The density of dimethylolpropionic acid is 1.37 at 20 °C (relative to water at 4 °C).


The inhalable fraction (< 100 µm) of dimethylolpropionic acid is 75%.

Vapour pressure

The vapour pressure of dimethylolpropionic acid was predicted to be 0.00058 Pa at 25 °C using SPARC and MPBPWIN calculation methods.

Partition coefficient

The partition coefficient (log Kow) for dimethylolpropionic acid is -1.1 at 25 °C.

Water solubility

The solubility of dimethylolpropionic acid in water is 101 g/L at 20°C.

Surface tension

The surface tension of dimethylolpropionic acid is 72 mN/m at 20°C.

Flash point

Not relevant for solids.


No self-ignition temperature was found for Bis-MPA.


Dimethylolpropionic acid is non flammable, non-pyrophoric and does not emit flammable gases in contact with water.


Examination of the structure indicates that there are no groups associated with explosive properties.

Oxidising properties

Due to its structural composition Bis-MPA is not considered to be oxidising. 

Stability in organic solvents

The stability in organic solvents is not considered critical.

Dissociation constant

The dissociation constant of dimethylolpropionic acid (pKa) is 4.68 at 20 °C.


Not required for solids.

Additional information